<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
*{
    margin: 0;
    border: 0;
    padding: 0;
}
/*.main{
    margin: 16px;
    width: 100px;
    height: 100px;
    border-width: 2px 4px 8px 16px;
    /*
      border-style: solid;
    border-width: 2px 4px 8px 16px;
    border-color: #0C0C0C #00F7DE #1b6d85 #FF5722;

} */
.body{
    margin: 0px auto;
    font-family: 宋体;
    font-size: 12px;
}
.main{
    background: skyblue;
    margin: 15px;
    padding: 12px;
}
.li{
   color: black;
    background: skyblue;
    margin: 15px;
    padding: 12px;
    list-style: none;
}
p.li{
    border-style: dashed;
    border-width: 5px;
    border-color: #2e6da4;
    margin-top: 20px;
}

.b{
    padding: 10px;
    margin: 20px 40px;
    border-width: 10px 20px 30px 40px;
    border-style: solid;
    width: 50px;
    height: 80px;
}





  </style>
</head>
<body>
<div class="b">

</div>

</body>
</html>